Chemistry · Grades 11–12
Standard cell potential
Subtract the anode reduction potential from the cathode reduction potential. Do not multiply potentials by equation coefficients.
Rule and assumptions
Subtract the anode reduction potential from the cathode reduction potential. Do not multiply potentials by equation coefficients.
E°cell = E°cathode − E°anode
Worked examples
The given standard reduction potentials are 0.42 V for the cathode and -0.48 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.
E°cell = E°cathode − E°anode 0.42 − (-0.48) = 0.9
0.9 V
The given standard reduction potentials are 0.94 V for the cathode and -0.76 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.
E°cell = E°cathode − E°anode 0.94 − (-0.76) = 1.7
1.7 V
Try two questions
The given standard reduction potentials are 0.89 V for the cathode and -1.54 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.
The given standard reduction potentials are 1.18 V for the cathode and -1.55 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.
Answers and reasoning
Answers and marking notes
- 2.43 V
E°cell = E°cathode − E°anode 0.89 − (-1.54) = 2.43
- 2.73 V
E°cell = E°cathode − E°anode 1.18 − (-1.55) = 2.73
Further reading and review references
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Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.